BM-onion

A couple years ago someone posted that there is a form of onion routing in the bitmessage protocol. Does anyone have documentation or instructions for activating it?
I don't mean running a tor node. This was a reference to opening onion circuits across the BM protocol.

Last year I helped to test a proof-of-concept called Mirrormaze, using the ACK mechanism to send covert messages by bouncing them off several third-parties. Interesting idea, though the security benefits are unclear. I don't think anything public came out of it.
Is this what you had in mind?

No. this is not what I had in mind.
As I said, someone posted here about onion circuits already built in to the bitmessage code. An onion circuit is an encrypted, multi-hop tunnel, as used in tor.
I want to know how to enable this feature so I can proxy my chat and browser through it.